NAME    [Toc]    [Back]

     strstr, strcasestr, strnstr -- locate a substring in a string

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <string.h>

     char *
     strstr(const char *big, const char *little);

     char *
     strcasestr(const char *big, const char *little);

     char *
     strnstr(const char *big, const char *little, size_t len);

DESCRIPTION    [Toc]    [Back]

     The strstr() function locates the first occurrence of the null-terminated
     string little in the null-terminated string big.

     The strcasestr() function is similar to strstr(), but ignores the case of
     both strings.

     The strnstr() function locates the first occurrence of the null-terminated
 string little in the string big, where not more than len characters
     are searched.  Characters that appear after a `\0' character are not
     searched.	Since the strnstr() function is a FreeBSD specific API, it
     should only be used when portability is not a concern.

RETURN VALUES    [Toc]    [Back]

     If little is an empty string, big is returned; if little occurs nowhere
     in big, NULL is returned; otherwise a pointer to the first character of
     the first occurrence of little is returned.

EXAMPLES    [Toc]    [Back]

     The following sets the pointer ptr to the "Bar Baz" portion of
     largestring:

	   const char *largestring = "Foo Bar Baz";
	   const char *smallstring = "Bar";
	   char *ptr;

	   ptr = strstr(largestring, smallstring);

     The following sets the pointer ptr to NULL, because only the first 4
     characters of largestring are searched:

	   const char *largestring = "Foo Bar Baz";
	   const char *smallstring = "Bar";
	   char *ptr;

	   ptr = strnstr(largestring, smallstring, 4);

SEE ALSO    [Toc]    [Back]

     memchr(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3),
     strspn(3), strtok(3)

STANDARDS    [Toc]    [Back]

     The strstr() function conforms to ISO/IEC 9899:1990 (``ISO C89'').


FreeBSD 5.2.1		       October 11, 2001 		 FreeBSD 5.2.1